Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 2)

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Income Taxes (Details 2)
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Income Tax Disclosure [Abstract]      
Federal statutory tax rate 35.00% 35.00% 35.00%
Increase/(decrease) resulting from:      
State income taxes, net of federal tax benefit 3.00% 3.30% 2.50%
Tax settlement 1.50% 0.00% 0.00%
Tax-exempt municipal bond interest (1.70%) (1.80%) (2.20%)
Other items (0.20%) (0.20%) (0.30%)
Effective income tax rate 37.60% 36.30% 35.00%